Although I don't have the AC/DC disc,...... I own, and have "compared" many other original- v/s- remastered cds.
Generally, the original cd's have more hiss, noise etc......BUT...are true to the original mix.
The remaster's sound "better" most of the time....BUT.....often,..the original mix has been "tampered" with, even re-mixed....(something I don't personally believe in, having heard these songs for so many years).
So I KEEP the old cds too.
LIFE: "Choices, balance, and timing"